gweb/gweb.c

   1 /*
   2  *
   3  *  Web service library with GLib integration
   4  *
   5  *  Copyright (C) 2009-2010  Intel Corporation. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <errno.h>
  28 #include <unistd.h>
  29 #include <stdlib.h>
  30 #include <stdarg.h>
  31 #include <string.h>
  32 #include <sys/socket.h>
  33 #include <arpa/inet.h>
  34
  35 #include "giognutls.h"
  36 #include "gresolv.h"
  37 #include "gweb.h"
  38
  39 #define DEFAULT_BUFFER_SIZE  2048
  40
  41 #define SESSION_FLAG_USE_TLS    (1 << 0)
  42
  43 struct _GWebResult {
  44         guint status;
  45         const guint8 *buffer;
  46         gsize length;
  47 };
  48
  49 struct web_session {
  50         GWeb *web;
  51
  52         char *address;
  53         char *host;
  54         uint16_t port;
  55         unsigned long flags;
  56
  57         GIOChannel *transport_channel;
  58         guint transport_watch;
  59
  60         guint resolv_action;
  61         char *request;
  62
  63         guint8 *receive_buffer;
  64         gsize receive_space;
  65         GString *current_header;
  66         gboolean header_done;
  67
  68         GWebResult result;
  69
  70         GWebResultFunc result_func;
  71         gpointer result_data;
  72 };
  73
  74 struct _GWeb {
  75         gint ref_count;
  76
  77         guint next_query_id;
  78
  79         int index;
  80         GList *session_list;
  81
  82         GResolv *resolv;
  83         char *accept_option;
  84         char *user_agent;
  85         gboolean close_connection;
  86
  87         GWebDebugFunc debug_func;
  88         gpointer debug_data;
  89 };
  90
  91 static inline void debug(GWeb *web, const char *format, ...)
  92 {
  93         char str[256];
  94         va_list ap;
  95
  96         if (web->debug_func == NULL)
  97                 return;
  98
  99         va_start(ap, format);
 100
 101         if (vsnprintf(str, sizeof(str), format, ap) > 0)
 102                 web->debug_func(str, web->debug_data);
 103
 104         va_end(ap);
 105 }
 106
 107 static void free_session(struct web_session *session)
 108 {
 109         GWeb *web = session->web;
 110
 111         if (session == NULL)
 112                 return;
 113
 114         g_free(session->request);
 115
 116         if (session->resolv_action > 0)
 117                 g_resolv_cancel_lookup(web->resolv, session->resolv_action);
 118
 119         if (session->transport_watch > 0)
 120                 g_source_remove(session->transport_watch);
 121
 122         if (session->transport_channel != NULL)
 123                 g_io_channel_unref(session->transport_channel);
 124
 125         g_string_free(session->current_header, TRUE);
 126         g_free(session->receive_buffer);
 127
 128         g_free(session->host);
 129         g_free(session->address);
 130         g_free(session);
 131 }
 132
 133 static void flush_sessions(GWeb *web)
 134 {
 135         GList *list;
 136
 137         for (list = g_list_first(web->session_list);
 138                                         list; list = g_list_next(list))
 139                 free_session(list->data);
 140
 141         g_list_free(web->session_list);
 142         web->session_list = NULL;
 143 }
 144
 145 GWeb *g_web_new(int index)
 146 {
 147         GWeb *web;
 148
 149         if (index < 0)
 150                 return NULL;
 151
 152         web = g_try_new0(GWeb, 1);
 153         if (web == NULL)
 154                 return NULL;
 155
 156         web->ref_count = 1;
 157
 158         web->next_query_id = 1;
 159
 160         web->index = index;
 161         web->session_list = NULL;
 162
 163         web->resolv = g_resolv_new(index);
 164         if (web->resolv == NULL) {
 165                 g_free(web);
 166                 return NULL;
 167         }
 168
 169         web->accept_option = g_strdup("*/*");
 170         web->user_agent = g_strdup_printf("GWeb/%s", VERSION);
 171         web->close_connection = FALSE;
 172
 173         return web;
 174 }
 175
 176 GWeb *g_web_ref(GWeb *web)
 177 {
 178         if (web == NULL)
 179                 return NULL;
 180
 181         g_atomic_int_inc(&web->ref_count);
 182
 183         return web;
 184 }
 185
 186 void g_web_unref(GWeb *web)
 187 {
 188         if (web == NULL)
 189                 return;
 190
 191         if (g_atomic_int_dec_and_test(&web->ref_count) == FALSE)
 192                 return;
 193
 194         flush_sessions(web);
 195
 196         g_resolv_unref(web->resolv);
 197
 198         g_free(web->accept_option);
 199         g_free(web->user_agent);
 200         g_free(web);
 201 }
 202
 203 void g_web_set_debug(GWeb *web, GWebDebugFunc func, gpointer user_data)
 204 {
 205         if (web == NULL)
 206                 return;
 207
 208         web->debug_func = func;
 209         web->debug_data = user_data;
 210
 211         g_resolv_set_debug(web->resolv, func, user_data);
 212 }
 213
 214 gboolean g_web_add_nameserver(GWeb *web, const char *address)
 215 {
 216         if (web == NULL)
 217                 return FALSE;
 218
 219         g_resolv_add_nameserver(web->resolv, address, 53, 0);
 220
 221         return TRUE;
 222 }
 223
 224 static gboolean set_accept_option(GWeb *web, const char *format, va_list args)
 225 {
 226         g_free(web->accept_option);
 227
 228         if (format == NULL) {
 229                 web->accept_option = NULL;
 230                 debug(web, "clearing accept option");
 231         } else {
 232                 web->accept_option = g_strdup_vprintf(format, args);
 233                 debug(web, "setting accept %s", web->accept_option);
 234         }
 235
 236         return TRUE;
 237 }
 238
 239 gboolean g_web_set_accept(GWeb *web, const char *format, ...)
 240 {
 241         va_list args;
 242         gboolean result;
 243
 244         if (web == NULL)
 245                 return FALSE;
 246
 247         va_start(args, format);
 248         result = set_accept_option(web, format, args);
 249         va_end(args);
 250
 251         return result;
 252 }
 253
 254 static gboolean set_user_agent(GWeb *web, const char *format, va_list args)
 255 {
 256         g_free(web->user_agent);
 257
 258         if (format == NULL) {
 259                 web->user_agent = NULL;
 260                 debug(web, "clearing user agent");
 261         } else {
 262                 web->user_agent = g_strdup_vprintf(format, args);
 263                 debug(web, "setting user agent %s", web->user_agent);
 264         }
 265
 266         return TRUE;
 267 }
 268
 269 gboolean g_web_set_user_agent(GWeb *web, const char *format, ...)
 270 {
 271         va_list args;
 272         gboolean result;
 273
 274         if (web == NULL)
 275                 return FALSE;
 276
 277         va_start(args, format);
 278         result = set_user_agent(web, format, args);
 279         va_end(args);
 280
 281         return result;
 282 }
 283
 284 void g_web_set_close_connection(GWeb *web, gboolean enabled)
 285 {
 286         if (web == NULL)
 287                 return;
 288
 289         web->close_connection = enabled;
 290 }
 291
 292 gboolean g_web_get_close_connection(GWeb *web)
 293 {
 294         if (web == NULL)
 295                 return FALSE;
 296
 297         return web->close_connection;
 298 }
 299
 300 static inline void call_result_func(struct web_session *session, guint status)
 301 {
 302         if (session->result_func == NULL)
 303                 return;
 304
 305         session->result_func(status, &session->result, session->result_data);
 306 }
 307
 308 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 309                                                         gpointer user_data)
 310 {
 311         struct web_session *session = user_data;
 312         guint8 *ptr = session->receive_buffer;
 313         gsize bytes_read;
 314         GIOStatus status;
 315
 316         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 317                 session->transport_watch = 0;
 318                 session->result.buffer = NULL;
 319                 session->result.length = 0;
 320                 call_result_func(session, 400);
 321                 return FALSE;
 322         }
 323
 324         status = g_io_channel_read_chars(channel,
 325                                 (gchar *) session->receive_buffer,
 326                                 session->receive_space - 1, &bytes_read, NULL);
 327
 328         debug(session->web, "bytes read %zu", bytes_read);
 329
 330         if (status != G_IO_STATUS_NORMAL) {
 331                 session->transport_watch = 0;
 332                 session->result.buffer = NULL;
 333                 session->result.length = 0;
 334                 call_result_func(session, 200);
 335                 return FALSE;
 336         }
 337
 338         session->receive_buffer[bytes_read] = '\0';
 339
 340         if (session->header_done == TRUE) {
 341                 session->result.buffer = session->receive_buffer;
 342                 session->result.length = bytes_read;
 343                 call_result_func(session, 100);
 344                 return TRUE;
 345         }
 346
 347         while (bytes_read > 0) {
 348                 guint8 *pos;
 349                 gsize count;
 350                 char *str;
 351
 352                 pos = memchr(ptr, '\n', bytes_read);
 353                 if (pos == NULL) {
 354                         g_string_append_len(session->current_header,
 355                                                 (gchar *) ptr, bytes_read);
 356                         return TRUE;
 357                 }
 358
 359                 *pos = '\0';
 360                 count = strlen((char *) ptr);
 361                 if (count > 0 && ptr[count - 1] == '\r') {
 362                         ptr[--count] = '\0';
 363                         bytes_read--;
 364                 }
 365
 366                 g_string_append_len(session->current_header,
 367                                                 (gchar *) ptr, count);
 368
 369                 bytes_read -= count + 1;
 370                 ptr = pos + 1;
 371
 372                 if (session->current_header->len == 0) {
 373                         session->header_done = TRUE;
 374                         session->result.buffer = pos + 1;
 375                         session->result.length = bytes_read;
 376                         call_result_func(session, 100);
 377                         break;
 378                 }
 379
 380                 str = session->current_header->str;
 381
 382                 if (session->result.status == 0) {
 383                         unsigned int code;
 384
 385                         if (sscanf(str, "HTTP/%*s %u %*s", &code) == 1)
 386                                 session->result.status = code;
 387                 }
 388
 389                 debug(session->web, "[header] %s", str);
 390
 391                 g_string_truncate(session->current_header, 0);
 392         }
 393
 394         return TRUE;
 395 }
 396
 397 static int connect_session_transport(struct web_session *session)
 398 {
 399         struct sockaddr_in sin;
 400         int sk;
 401
 402         sk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 403         if (sk < 0)
 404                 return -EIO;
 405
 406         memset(&sin, 0, sizeof(sin));
 407         sin.sin_family = AF_INET;
 408         sin.sin_port = htons(session->port);
 409         sin.sin_addr.s_addr = inet_addr(session->address);
 410
 411         if (connect(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 412                 close(sk);
 413                 return -EIO;
 414         }
 415
 416         if (session->flags & SESSION_FLAG_USE_TLS)
 417                 session->transport_channel = g_io_channel_gnutls_new(sk);
 418         else
 419                 session->transport_channel = g_io_channel_unix_new(sk);
 420
 421         if (session->transport_channel == NULL) {
 422                 close(sk);
 423                 return -ENOMEM;
 424         }
 425
 426         g_io_channel_set_encoding(session->transport_channel, NULL, NULL);
 427         g_io_channel_set_buffered(session->transport_channel, FALSE);
 428
 429         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
 430
 431         session->transport_watch = g_io_add_watch(session->transport_channel,
 432                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 433                                                 received_data, session);
 434
 435         return 0;
 436 }
 437
 438 static int create_transport(struct web_session *session)
 439 {
 440         int err;
 441
 442         err = connect_session_transport(session);
 443         if (err < 0)
 444                 return err;
 445
 446         debug(session->web, "creating session %s:%u",
 447                                         session->address, session->port);
 448
 449         return 0;
 450 }
 451
 452 static void start_request(struct web_session *session)
 453 {
 454         GString *buf;
 455         gchar *str;
 456         gsize count, bytes_written;
 457         GIOStatus status;
 458
 459         debug(session->web, "request %s from %s",
 460                                         session->request, session->host);
 461
 462         buf = g_string_new(NULL);
 463         g_string_append_printf(buf, "GET %s HTTP/1.1\r\n", session->request);
 464         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 465         if (session->web->user_agent != NULL)
 466                 g_string_append_printf(buf, "User-Agent: %s\r\n",
 467                                                 session->web->user_agent);
 468         if (session->web->accept_option != NULL)
 469                 g_string_append_printf(buf, "Accept: %s\r\n",
 470                                                 session->web->accept_option);
 471         if (session->web->close_connection == TRUE)
 472                 g_string_append(buf, "Connection: close\r\n");
 473         g_string_append(buf, "\r\n");
 474         str = g_string_free(buf, FALSE);
 475
 476         count = strlen(str);
 477
 478         debug(session->web, "bytes to write %zu", count);
 479
 480         status = g_io_channel_write_chars(session->transport_channel,
 481                                         str, count, &bytes_written, NULL);
 482
 483         debug(session->web, "status %u bytes written %zu",
 484                                                 status, bytes_written);
 485
 486         //printf("%s", str);
 487
 488         g_free(str);
 489 }
 490
 491 static int parse_url(struct web_session *session, const char *url)
 492 {
 493         char *scheme, *host, *port, *path;
 494
 495         scheme = g_strdup(url);
 496         if (scheme == NULL)
 497                 return -EINVAL;
 498
 499         host = strstr(scheme, "://");
 500         if (host != NULL) {
 501                 *host = '\0';
 502                 host += 3;
 503
 504                 if (strcasecmp(scheme, "https") == 0) {
 505                         session->port = 443;
 506                         session->flags |= SESSION_FLAG_USE_TLS;
 507                 } else if (strcasecmp(scheme, "http") == 0) {
 508                         session->port = 80;
 509                 } else {
 510                         g_free(scheme);
 511                         return -EINVAL;
 512                 }
 513         } else {
 514                 host = scheme;
 515                 session->port = 80;
 516         }
 517
 518         path = strchr(host, '/');
 519         if (path != NULL)
 520                 *(path++) = '\0';
 521
 522         session->request = g_strdup_printf("/%s", path ? path : "");
 523
 524         port = strrchr(host, ':');
 525         if (port != NULL) {
 526                 char *end;
 527                 int tmp = strtol(port + 1, &end, 10);
 528
 529                 if (*end == '\0') {
 530                         *port = '\0';
 531                         session->port = tmp;
 532                 }
 533         }
 534
 535         session->host = g_strdup(host);
 536
 537         g_free(scheme);
 538
 539         return 0;
 540 }
 541
 542 static void resolv_result(GResolvResultStatus status,
 543                                         char **results, gpointer user_data)
 544 {
 545         struct web_session *session = user_data;
 546
 547         if (results == NULL || results[0] == NULL) {
 548                 call_result_func(session, 404);
 549                 return;
 550         }
 551
 552         debug(session->web, "address %s", results[0]);
 553
 554         if (inet_aton(results[0], NULL) == 0) {
 555                 call_result_func(session, 400);
 556                 return;
 557         }
 558
 559         session->address = g_strdup(results[0]);
 560
 561         if (create_transport(session) < 0) {
 562                 call_result_func(session, 409);
 563                 return;
 564         }
 565
 566         start_request(session);
 567 }
 568
 569 guint g_web_request(GWeb *web, GWebMethod method, const char *url,
 570                                 GWebResultFunc func, gpointer user_data)
 571 {
 572         struct web_session *session;
 573
 574         if (web == NULL || url == NULL)
 575                 return 0;
 576
 577         debug(web, "request %s", url);
 578
 579         session = g_try_new0(struct web_session, 1);
 580         if (session == NULL)
 581                 return 0;
 582
 583         if (parse_url(session, url) < 0) {
 584                 free_session(session);
 585                 return 0;
 586         }
 587
 588         debug(web, "host %s:%u", session->host, session->port);
 589         debug(web, "flags %lu", session->flags);
 590
 591         session->web = web;
 592
 593         session->result_func = func;
 594         session->result_data = user_data;
 595
 596         session->receive_buffer = g_try_malloc(DEFAULT_BUFFER_SIZE);
 597         if (session->receive_buffer == NULL) {
 598                 free_session(session);
 599                 return 0;
 600         }
 601
 602         session->receive_space = DEFAULT_BUFFER_SIZE;
 603         session->current_header = g_string_sized_new(0);
 604         session->header_done = FALSE;
 605
 606         if (inet_aton(session->host, NULL) == 0) {
 607                 session->resolv_action = g_resolv_lookup_hostname(web->resolv,
 608                                         session->host, resolv_result, session);
 609                 if (session->resolv_action == 0) {
 610                         free_session(session);
 611                         return 0;
 612                 }
 613         } else {
 614                 session->address = g_strdup(session->host);
 615
 616                 if (create_transport(session) < 0) {
 617                         free_session(session);
 618                         return 0;
 619                 }
 620
 621                 start_request(session);
 622         }
 623
 624         web->session_list = g_list_append(web->session_list, session);
 625
 626         return web->next_query_id++;
 627 }
 628
 629 guint16 g_web_result_get_status(GWebResult *result)
 630 {
 631         if (result == NULL)
 632                 return 0;
 633
 634         return result->status;
 635 }
 636
 637 gboolean g_web_result_get_chunk(GWebResult *result,
 638                                 const guint8 **chunk, gsize *length)
 639 {
 640         if (result == NULL)
 641                 return FALSE;
 642
 643         if (chunk == NULL)
 644                 return FALSE;
 645
 646         *chunk = result->buffer;
 647
 648         if (length != NULL)
 649                 *length = result->length;
 650
 651         return TRUE;
 652 }